Harald Haas: Forget Wi-Fi. Meet the new Li-Fi Internet
Harald Haas: Um novo tipo revolucionário de Internet sem fios
Harald Haas is the pioneer behind a new technology that can communicate as well as illuminate. Full bio
Double-click the English transcript below to play the video.
for the first time in public
pela primeira vez em público
acting as a receiver.
usando um portátil como recetor.
it's just light.
"Qual o propósito disso?"
extension of the Internet
"The Internet of Things" --
connected to the Internet.
de aparelhos ligados à Internet.
of the Internet can only work
da Internet somente funcionará
infrastructure as much as possible.
a infraestrutura pré-existente ao máximo.
and the LED come in.
to transmit data incredibly fast,
para transmitir dados com incrível rapidez
of the brightness.
de subtis mudanças de luminosidade.
we have many LEDs around us,
vemos muitas lâmpadas LED,
of Li-Fi transmitters around us.
de transmissores de Li-Fi à nossa volta.
special devices -- small photo detectors,
especiais — pequenos fotodetetores —
encoded in the data.
codificadas nos dados.
existing infrastructure
utilizar a infraestrutura já existente
solar cells and solar panels.
sobre painéis e células solares.
and converts it into electrical energy.
em energia elétrica.
to charge our mobile phone.
para carregar os nossos telemóveis.
of the brightness of the LED,
mudanças de luminosidade do LED,
from the solar cell.
pela célula solar.
a principal mechanism in place
um importante mecanismo
and by the solar cell,
através da célula solar,
of the energy harvested
da energia recolhida
changes of the brightness,
de luminosidade rápidas e subtis,
by our LED lights?
pelas nossas luzes LED?
megabytes per second
até 50 megabytes por segundo
broadband connections these days.
das ligações de banda-larga hoje em dia.
off-the-shelf LED lamp.
off-the-shelf solar cell;
we harvest from the solar cell.
através da célula solar.
something at the moment.
harvests light from the ambient light.
já está a absorver a luz ambiente.
is switch on the light,
the instrument jumps to the right.
do instrumento salta para a direita.
from this artificial light source.
desta fonte de luz artificial.
vemos como o ponteiro volta para trás.
the streaming of the video.
a transmissão deste vídeo.
by pressing this button.
is streaming a video
está a transmitir o vídeo
in a very subtle way,
na luminosidade do LED
recognize with your eye,
identificar a olho nu
are too fast to recognize.
the energy harvesting drops
o nível de energia recolhida diminui
the video will restart.
o vídeo reinicia.
and energy harvesting stops as well.
e a recolha de energia também para.
acts as a receiver.
funciona como um recetor.
is a street light, and there's fog.
é um candeeiro da rua, e há nevoeiro.
a handkerchief with me.
um lenço de bolso.
over the solar cell.
sobre a célula solar.
de energia recolhida diminui,
the handkerchief to the solar cell,
através do lenço para a célula solar
and stream that information,
de descodificar e transmitir informações
a solar cell has become a receiver
é que a célula solar tornou-se um recetor
encoded in light,
rede sem fios de alta velocidade
as an energy-harvesting device.
de instrumento coletor de energia.
células solares pré-existentes
on the roof of a hut
or indeed, lamp post.
num morro próximo ou num candeeiro da rua.
where the beam hits the solar cell.
acerte na célula solar.
integrated into windows,
integradas em janelas,
into street furniture,
em mobiliário urbano,
into these billions of devices
em milhares de milhões de aparelhos
carregar estes aparelhos regularmente
these devices regularly,
every few months.
que só duram uns meses.
que mostro isto publicamente.
I've shown this in public.
de laboratório, um protótipo.
that we can take this to market
que podemos pôr isto no mercado
to closing the digital divide,
para a eliminação do fosso digital
of devices to the Internet.
de aparelhos à Internet.
no consumo de energia
of energy consumption --
quite the opposite.
devido as células solares,
ABOUT THE SPEAKER
Harald Haas - Communications technology innovatorHarald Haas is the pioneer behind a new technology that can communicate as well as illuminate.
Why you should listen
Imagine using your car headlights to transmit data ... or surfing the web safely on a plane, tethered only by a line of sight. Harald Haas is working on it. He currently holds the Chair of Mobile Communications at the University of Edinburgh, and is co-founder and Chief Scientific Officer of pureLiFi Ltd as well as the Director of the LiFi Research and Development Center at the University of Edinburgh. His main research interests are in optical wireless communications, hybrid optical wireless and RF communications, spatial modulation, and interference coordination in wireless networks.
Haas has long been studying ways to communicate electronic data signals, designing modulation techniques that pack more data onto existing networks. But his latest work leaps beyond wires and radio waves to transmit data via an LED bulb that glows and darkens faster than the human eye can see. His group published the first proof-of-concept results demonstrating that it is possible to to turn commercially available light emitting diode (LED) light bulbs into broadband wireless transmission systems.
"It should be so cheap that it's everywhere," he says. "Using the visible light spectrum, which comes for free, you can piggy-back existing wireless services on the back of lighting equipment."
Harald Haas | Speaker | TED.com